/ Dictionary / Index P ppt.: Meaning and Definition of Find definitions for: ppt. Pronunciation: [key] — Chem. Chem. precipitate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pps ppv Related Content Daily Word Quiz: abdicate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language